I want to read a word document in which tables are incorporated with a preferred width.How can i read that preferred width?

I have tried

nestedTable.PreferredWidthType = Word.WdPreferredWidthType.wdPreferredWidthPercent;
int tableW = Convert.ToInt32(nestedTable.PreferredWidth);
MessageBox.Show(tableW.ToString ());

But its not working either way.

Please help.
Ihave to complete this task or my PM will kill me....